works. The Doctor asks Vida to show him the 'biggest and shiniest lab' she has. Vida says that she hasn't been able to contact her boss all day, and there is a Vice Admiral Kelper from Norfolk due to arrive the next day. The Doctor tells Rose to have Mickey come over and bring Keisha. Vida talks about her work studying ocean currents, what is in them and how they move around, using tracers they had developed. The Doctor is busy being all 'boy-with-a-train-set' with the water he brought. Vida says they were studying water taken from the area where the Ascendant sank, and found no sign of tracers, but there were salts and proteins unlike anything previously discovered. The Doctor asks Mickey and Vida to go through the naval personnel records and see if the crew of the Ascendant had anything in common. He takes blood samples from Rose, Keisha, and Vida, and finds that Rose and Keisha have alien matter in their blood, and specks in their eyes. While going through the computer files, Mickey looks up Commodore Powers (Crayshaw's boss), and discovers that he was on a ship that sank in the North Sea three years ago. Then they find that a John Anthony Crayshaw sank in the North Sea in 1759. They run to tell the Doctor. The Doctor is still working with the water when he realizes the beaker he is analysing is empty, and the sink is full. He smells seawater, and then the water in the sink jumps out and attacks him, covering his face, but he manages to escape. Rose is in the hallway with Keisha when Mickey and Vida come up, and then suddenly it fills with water. Three figures appear in it – a pirate, U-boat captain, and a Victorian lady. They grab Vida and carry her away. Rose chases after, grabbing onto the back of a police van. When the van stops, Rose finds herself near the river. While trying to help someone else, she falls into the water and is taken by the water creatures. The Doctor, Mickey, and Keisha drive around for hours, but cannot find either Rose or Vida. They go back to the estate, and Mickey walks Keisha to her door while the Doctor waits in the car. They see a dripping wet Rose ghost, and when the Doctor comes upstairs, he says that he